Draw-gear and buffing apparatus



PATENTED FEB. 9, 1904.

J. H. MGGORMIGK.

DRAW GEAR AND BUPFING APPARATUS.

APPLICATION FILED SEPT. 13. 1902.

2 SHEETS-SHEET 1.

N0 MODEL.

No. 751,673. PATENTED FEB. 9, 1904. J. H, MoGORMIGK.

DRAW GEAR AND BUFFING APPARATUS.

APPL IOATIOH FILED SEPT. 13. 1902.

no MODEL. 2 sums-sum 2.

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z k 47 43 I WITNESSES: Y INVENTOR I ATTORNEY UNITED STATES Patented February 9, 1904.

PATENT OEEIcE.

JOHN H. MCCORMICK, OF COLUMBUS, OHIO.

SPECIFICATION forming part of Letters Patent No. 751,673, dated February 9, 1904.

Application filed September 18, 1902. Serial No. 123,224. No model.)

To all whom, it may concern:

Be it known that I, J OHN H. McCoRMIcK, a citizen of the United States, residing at C0- lumbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvement in Draw-Gear and Buffing Apparatus, of which the following is a specification.

My invention relates to that class or type of draw-gear and buffing apparatus in which frictional resistance is employed, in connection with a resisting-spring, to reduce shocks and prevent rebound that result from heavy bodies, such as cars, meeting in violent contact with each other.

The objects of my invention are to provide an improved construction of this character having increased efficiency and embodying the elements of simplicity, strength, durability, and reduced cost of construction; to so construct my improved apparatus as to employ a resistance-spring normally uncompressed, thereby permitting a full compression of the spring in the operation or movement of the moving friction element; to obviate the necessity of employing the resistance-spring to compensate for wear of the friction elements, and to so construct my improved drawgear and buffing apparatus as to admit of its being readily adapted to the existing construction of cars. These objects I accomplish in the manner illustrated in the accompanying drawings, in which Figure 1 is a central longitudinal section of my device on line 0 a: of Fig. 3. Fig. 2 is a plan view of the same, showing for the sake of clearness one of the side sill-plates cut away to half its depth. Fig. 3 isa transverse section on line i y of Fig. 2, and Fig. 4 is a similar section on line 2; of Fig. 2. 1

Similar numerals refer to similar parts throughout the several views.

1 represents the end portion of a car drawbar, with which is rigidly connected the ends of a yoke-strap 2. This outwardly-extending yoke embraces the upper and lower sides and outer end of the primary movable friction-block, which is indicated at 3. This block 3, as indicated more clearly in Fig. 4 of the drawings, is in the nature of an oblong body,

having its opposite sides provided with longitudinally-arranged V-shaped or angular recesses, which serve to divide the block into upper and lower wedge-like portions, which are united by the comparatively thin central web 3. The central part of the block 3 is recessed or hollowed out, and within this re cessed portion is inserted an uncompressed spring 7 the ends of which bear against the end faces 3 of said recessed portion.

1 represents said secondary friction-blocks, which are approximately wedge-shaped in cross-section and which, as shown, are adapted to enter and fit within the correspondinglyshaped side recesses of the block 3, the inclined or beveled surfaces 4 of said sections a being in frictional contact with the adjoining surfaces 3 of the section 3; Each of the sections 4 is provided in its central portion and on its inner side with a rounded recess, these recesses forming, in conjunction with the central recess of the section 3, a receptacle for the spring 7. The outer face of each of the blocks or sections 4: has formed therein on opposite sides of the center of the length vertical V-shaped or angular recesses 5.

8 represents the usual parallel frame-sills, with the inner faces of which are connected the sill-plates 6 of channel form, said sillplates supporting in the manner hereinafter described my improved apparatus. Opposite each of the side recesses 5 of each of the blocks or sections at the adjoining sill-plate 6 is formed with a transverse recess 6, which is in the nature of a channel having a central projection 6, the face of which is inclined from the upper and outer portion of the sillplate to a point in the lower and inner portion thereof, this being shown more clearly in Fig. 4 of the drawings.

As indicated more clearly in Figs. 2 and 3 of the drawings, the friction sections or elements & are formed with upper and lower side flanges r, which project within upper and lower portions of the sill-plates. Within each of the sill-plate channels 6 1 provide a wedge-body 5, these wedges having their vertical faces in contact with the sides of the sections a and their inclined faces in contact with the inclined faces 6 of the sill-plates.

These wedges, although of less length or height than the recesses 63*, are of corresponding shape in cross-section, and by their engagementwith the inclined faces of the recesses 5 and the shoulders of the sill-plates formed by the production of the recesses 6 serve to lock the sections 4 in connection with said sill-plates.

The connection heretofore described between the movable and primary friction block or element 3 and the draw-bar insures a corresponding longitudinal movement of said block 3 with said draw-bar, and it is obvious that regardless of whether this movement is backward or forward the spring 7 will be subjected to compression against the ends of the inner recesses of the sections 4:,said springs thus operating to cushion the draw-bar against shock or jar. It has been customary in constructions of this class to employ a resistancespring which also performs the oflice of taking up or compensating for the wear on the frictional parts, and in such cases the spring is normally compressed. It will be observed that by my construction the spring is normally uncompressed, and in the manner hereinafter described other means are employed for taking up the wear of the frictional parts, and the spring is permitted afull compression when acted upon by the movable section. IVhile the spring 7 serves to resist longitudinal movement of the block 3, it will be seen that the frictional contact of the beveled faces of the wedges 5 with the corresponding bevels or inclines of the recesses 5 results in an inward pressure of the blocks 4 against the block 3, thus providing an additional resistance against longitudinal movement of the latter.

It is obvious that such wear as may be occasioned by the frictional contact of the pri mary and secondary friction elements will be automatically taken up by the gradual downward movement of the wedges 5 Within the sillplate recesses 6".

It will be understood that the spring 7 operates to return the parts to normal positions; but its force is modified by the reaction of the spring on the blocks 4:. The force of the reacting spring against the blocks I is equal to the resistance of the returning parts and will act the same in creating frictional resistance between the returning-block 3 and the fixed blocks 4, as when the motion of the block 3 was in the reversed direction. The frictional resistance created acts directly on the returning-blocks 3, and the force of the return will be hessened to the extent of the friction create It will be seen that the construction herein described is simple and reliable.

Having now fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination with a friction element movable forward and backward from normal position, and a fixed friction element, of an interposed spring, and means for exerting a pressure inward toward the central line of draft against the movable friction element.

2. The combination with a movable frictional element, a fixed frictional element, and an interposed spring, of a wedging device having one bevel for creating friction and another bevel for compensating for wear of the friction elements.

3. The combination with elements adapted I to be forced together to create friction, of an interposed spring, and a wedging device having separate bevels for creating friction and compensating for wear of the friction elements.

4. In a draw-gear and buffing apparatus, the combination with a movable friction element, of a fixed friction element having beveled faces, of bearing-wedges having beveled surfaces which contact with the bevels on the fixed element, and a resisting-spring, substantially as specified.

5. In a draw-gear and bufiing apparatus, the combination with a movable friction element, of a fixed friction element having wedging-faces beveled in opposite directions, fixed bearing-wedges having bevels contacting with the bevels on the fixed friction element, and a spring hearing at both ends on bearing-faces of the fixed friction element so that compression from either direction will exert a pressure on the primary friction element, substantially as specified.

6. In a draw-gear and bufiing apparatus, the combination with a primary friction element, of a secondary friction element, and a gravity Wedge for taking up lost motion due to wear of the friction parts, substantially as specified.

JOHN H. MCCORMICK. In presence of Tnos. O. MORGAN, A. L. PHELPs. 

